[time-nuts] [OT] Ikea Lamp

[Brooke Clarke]

Hi Paul:

LEDs come in many flavors of white.  The ones called warm white can be 
very comfortable but they are not as bright as the plain white or cool 
white LEDs.

Also high power LEDs can burn your eye.  Not because they emit UV but 
rather just because they are bright, like the Sun.
http://www.prc68.com/I/LED.shtml#Atlas  This is a 7 Watt LED that burned 
my eyes.

Wien's displacement law relates the wavelength emitted from a hot body 
to it's surface temperature.  For numbers for the Sun or a human see:
http://www.prc68.com/I/Probeye.shtml#WaT
Planck's law took another five years to relate frequency and surface temp.

Have Fun,

Brooke Clarke
http://www.PRC68.com


paul swed wrote:
> IKEA and $39 per lamp. Sounds like some pretty good margin in the sale.
> I guess these LED things will be main stream and save the world when we see
> them at walmart for $6.
>
> On my bench I converted to 60 watt halogen lamps compared to the 100 watt
> lamp.
> Equivalent color spectrum to the traditional lamp also. For as many hours as
> that light is on. I suspect I am saving some money in the long run.
>
> Curious are these lights truly white or do they tend towards a traditional
> lamp spectrum.
> Regards
>
> On Sat, Jan 30, 2010 at 8:15 AM, Didier Juges<didier at cox.net>  wrote:
>
>    
>> Yes, it is frustrating, they have to be the last dinosaurs of consumer
>> distribution.
>>
>> For me, the nearest store is 6 hours away, if I don't get stopped for a
>> speeding ticket on the way...
>> So I can't afford to be interested in what they may have for sale.
>>
>> Didier
>>
>>      
>>> -----Original Message-----
>>> From: time-nuts-bounces at febo.com
>>> [mailto:time-nuts-bounces at febo.com] On Behalf Of Brooke Clarke
>>> Sent: Friday, January 29, 2010 3:07 PM
>>> To: Discussion of precise time and frequency measurement
>>> Subject: Re: [time-nuts] [OT] Ikea Lamp
>>>
>>> Hi David:
>>>
>>> Thanks for the link.  I like them.  The only problem is that
>>> you can not order on line or by phone from Ikea and the
>>> nearest store is over two hours drive away.
>>>
>>>        
>>
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